Sorry for double-posting.
Some more info already out.
Kuu is scheduled as guest for the radio show J-Wave Groove Line in two days, 07/06, and they"re going to air a new song for the first time!
https://rhythmzone.net/koda/schedule...ge=&id=1089600
https://mobile.twitter.com/kuuchanlo...49564579287040
So announcement tomorrow and Tuesday premiere of a new song on radio!
Kuu is also going to appear on the variety show Ningen Kansatsu Variety Monitoring again, the next episode this coming Thursday, 07/08.
https://tver.jp/episode/87763002
The description just mentions 12 hit songs in a row from different artists, Kuu is one of them. They use the word "shikakenin", which means a luring person for something like candid camera.
Not clear yet, if she's there as a guest performing for it or a hit song of her is featured differently.